Q1
What is the law of reflection?
AAngle of incidence equals angle of reflection
BLight always bends
CLight disappears at surfaces
DAngles are always different
ICSEClass 8 (ICSE)ScienceCh 5 · Topic 2
Practice and Revision - Light Energy
Let us practise and revise what we learned about light energy. Light energy enables sight and interacts with matter through reflection, refr
Core concept
Reflection follows specific laws, with the angle of incidence equal to the angle of reflection, used in mirrors and periscopes.
How it works
Refraction occurs when light changes speed and bends while passing between different mediums, like from air into glass or water.
Why it matters
Dispersion is the splitting of white light into its component colours (like a rainbow), occurring when light passes through a prism.
Key detail
Understanding these light phenomena helps explain how eyes, cameras, telescopes, and other optical devices work.
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Quick notes
• Reflection: angle of incidence equals angle of reflection.
• Mirrors and periscopes use reflection.
• Refraction bends light between different mediums.
• This happens between air and water or glass.
• Dispersion splits white light into colours.
• A prism disperses light, like a rainbow.
• This explains eyes, cameras and telescopes.
• Light phenomena are fundamental to optics.